Hi the game engine does have limitations which mean performance issues even on the highest spec machines. One thing to try is your Process Affinity Mask, which is currently at default due to the ; in front of the line:
[rts]
;ProcessAffinityMask=1
Use SAS~Storebror's utility to get the right setting for you:
https://www.sas1946.com/main/index.php/topic,32520.msg347098.html#msg347098My quad core is set to 84 so the entry looks like:
[rts]
ProcessAffinityMask=84
Also, if you get stutters over water then try water=2. My spec is higher than yours but I get the same at water=4. Carsmasters water=4 mod also reduces performance further.
If you are using Gurners FX then the performance will dip more when there are explosions. Try without it, default 4.12 explosions have minimal impact on my system but Gurners FX can take 5-10 fps off. The Gurners smoke effects also give a FPS hit
I've upgraded, maxed RAM, overclocked my CPU and GPU but eventually accepted that due to the age of the game there is a trade off between visuals and smooth running.
I also use an older Nvidia driver because newer ones cause stutters. Not at my gaming PC but pretty sure it's 320.49
Hope that helps.
Regards,
M